<!DOCTYPE html>
<html>

<head>
  <title>数据分析平台</title>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css">
</head>

<body class="p-5">
  <div class="container">
    <h1>上传数据文件（CSV 或 Excel：.xlsx/.xls/.xlsm）</h1>
    <form method="POST" enctype="multipart/form-data">
      <div class="mb-3">
        <input class="form-control" type="file" name="file" accept=".csv,.xlsx,.xls,.xlsm" required>
      </div>
      <button class="btn btn-primary" type="submit">上传并分析</button>
    </form>
  </div>
</body>

</html>